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Low-temperature crystallization of calcium phosphate coatings synthesized by ion-beam-assisted deposition

✍ Scribed by Luo, Z. S. ;Cui, F. Z. ;Li, W. Z.

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
503 KB
Volume
46
Category
Article
ISSN
0021-9304

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✦ Synopsis

Crystallization temperature of the amorphous calcium phosphate coating synthesized by ion-beamassisted deposition successfully was decreased to 400Β°C for the making of orthopedic implants with better qualities. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) were used to investigate the morphological and structural evolution of the crystals in the coating during post-heat treatment. The crystallization of calcium phosphate coating is a hydroxyl-diffusion-controlled process, which is thought to be the mechanism responsible for the decrease of the crystallization temperature. In addition, the detailed crystallization process of calcium phosphate coating is elaborated in the present paper. The results show that the crystallinity of the hydroxyapatite coating can be well controlled by adjusting the post-heat-treatment time.

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## Abstract An electrochemical method for the deposition of calcium phosphate phases on titanium surfaces using the galvanostatic mode is presented. Deposition was performed in a (Ca^2+^/H~x~PO~4~^(3βˆ’__x__)βˆ’^)‐containing electrolyte near physiological conditions with regard to pH (6.4) and temperat